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{{main|Carbene C−H insertion}}
[[image:Carbene_one-step-insertion.svg|thumb|Carbene insertion]]
[[Carbene C-H insertion|Insertions]] are another common type of carbene reactions. The carbene basically interposes itself into an existing bond. The order of preference is commonly:
# X–H bonds where X is not carbon # C–H bond # C–C bond. Insertions may or may not occur in single step. [[Intramolecular reaction|Intramolecular]] insertion reactions present new synthetic solutions. Generally, rigid structures favor such insertions to happen. When an intramolecular insertion is possible, no [[intermolecular]] insertions are seen. In flexible structures, five-membered ring formation is preferred to six-membered ring formation. Both inter- and intramolecular insertions are amendable to asymmetric induction by choosing chiral ligands on metal centers.
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